CCD photometry of the old open cluster Collinder 261 ⋆
نویسندگان
چکیده
We present UBVI photometry for the old open cluster Collinder 261. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B−V)=0.25−0.34, (m-M)0=11.7-12.0, and age=7−8 Gyr or 9−11 Gyr, depending on the adopted stellar tracks. The models in better agreement with the data turn out to have metallicity at most solar.
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High - resolution spectroscopy of the old open cluster Collinder 261 : abundances of Iron and other elements ⋆
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